Add Travis CI + Platform.io

extras/test_build/test_build.ino

@@ -0,0 +1,53 @@
+/**************************************************************
+ *
+ *  DO NOT USE THIS - this is just a compilation test!
+ *
+ **************************************************************/
+
+#include <TinyGsmClient.h>
+
+TinyGsmClient client(Serial);
+
+char server[] = "somewhere";
+char resource[] = "something";
+
+void setup() {
+  Serial.begin(115200);
+  delay(3000);
+  client.restart();
+}
+
+void loop() {
+  if (!client.networkConnect("YourAPN", "", "")) {
+    delay(10000);
+    return;
+  }
+  if (!client.connect(server, 80)) {
+    delay(10000);
+    return;
+  }
+
+  // Make a HTTP GET request:
+  client.print(String("GET ") + resource + " HTTP/1.0\r\n");
+  client.print(String("Host: ") + server + "\r\n");
+  client.print("Connection: close\r\n\r\n");
+
+  unsigned long timeout = millis();
+  while (client.connected() && millis() - timeout < 10000L) {
+    // Print available data
+    while (client.available()) {
+      char c = client.read();
+      timeout = millis();
+    }
+  }
+
+  client.stop();
+
+  client.networkDisconnect();
+
+  // Do nothing forevermore
+  while (true) {
+    delay(1000);
+  }
+}
+